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Widiarso Dian Agus
Program Studi Teknik Geologi Universitas Diponegoro, Semarang
Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Physics Other

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GEOLOGI DAN ALTERASI HIDROTERMAL DAERAH BANTAR KARET DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Rizal Dwi Febriyana; Yoga Aribowo; Dian Agus Widiarso
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1750.865 KB)

Abstract

Alteration type at zone of mineralization has its own properties and characteristics that often characterized by the presence of mineral assemblage. The existence of alteration zone occurred due to changes mineral composition of rocks as a result of interaction between fluida of hydrothermal and wall-rocks. Alteration of hydrothermal is very closely linked with mineralization. Mineralization is an assembly and accumulation process of valuable rare minerals in the rocks to form ore deposits. Geological studies related to the characteristics and distribution of alteration and mineralization will assist in the planning of exploration process in the area. The aim of this study is to know the condition of geological research area that include variation of morphology, stratigraphy, structural of geology, alteration types are develop in the study area, as well as the relationship between altered minerals the result of hydrothermal alteration to precipitate epithermal mineralization in the study area.The methods used in this study include field mapping, followed by the method of sample analysis. Method of field mapping carried out by observing the lithology, structural of geology, geomorphology and alteration at Bantar Karet and surrounding areas, Nanggung subdistrict, Bogor Regency, West Java . Method of analysis carried out by analysis of petrology, petrography, mineralgraphy , X - ray diffractometer and the structure analysis of the lineament pattern.Lithology of the research area, beginning Early Miocene with sequence from old to young are unit of laminated tuff, unit of volcanic breccia, unit of andesite lava, unit of lapilli tuff, unit of tuff and unit of dacite intrusion. Structural of geology that develop in the study area are joint, fault that related with the lineament pattern, the main direction are Southwest-Northeast and Northwest-Southeast. Geomorphology of the study area was divided into two : the unit of volcanic landforms are very steep mountains and the unit of volcanic landforms are steep hilly. Alteration zones are contained in the study area, becoming three zones, there are Chlorite ± Smectite Alteration Zone (Propylitic), Smectite Alteration Zone - Kaolinite ± Montmorillonite (Argillic) and Silicified Zones. The mineralization exist are dessiminated Pyrite as ore mineral and oxide mineral such as Hematite which is the alteration of Magnetite and Feromagnesian on temperature conditions < 260oC. Characteristics of deposition types that developed in the study area based on the identification of geology, included alteration and mineralization is low sulphidation epithermal.
ANALISIS KESTABILAN LERENG MENGGUNAKAN METODE ROCK MASS RATING, SLOPE MASS RATING, DAN JANBU PADA JALAN SUMBING, KELURAHAN BENDUNGAN, KECAMATAN GAJAHMUNGKUR, KOTA SEMARANG Herfaes, Bey Anandha; Giraldi, Devina Aldalivia Budhi; Yasmin, Lutfia; Widiarso, Dian Agus
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.153

Abstract

Kestabilan lereng merupakan suatu kondisi atau keadaan yang mantap atau stabil terhadap suatu bentuk dan dimensi lereng. Gerakan tanah yang terjadi di Indonesia setiap tahunnya mengalami peningkatan terutama pada musim hujan. Pergerakan massa tanah merupakan suatu proses geologi yang dimana merupakan hasil interaksi kondisi yang terjadi pada suatu lingkungan seperti morfologi, geologi, struktur geologi, hidrogeologi, dan penggunaan lahan. Selain itu, terdapat juga pengaruh dari kondisi tektonik yang ada diIndonesia, yang dimana kondisi tektonik ini menyebabkan terbentuknya kenampakan morfologi berupa tinggian, patahan, batuan yang mudah lapuk yang dikarenakan adanya pengaruh iklim tropis, sehingga menyebabkan potensi gerakan tanah semakin tinggi. Selain itu, adanya faktor pertumbuhan penduduk yangsangat pesat, dapat memberikan dampak juga pada perubahaan tata guna lahan, sehingga mengakibatkanbencana gerakan tanah akan semakin meningkat. Keruntuhan pada lereng alami atau buatan disebabkan karena adanya perubahan antara lain topografi, seismik, aliran air tanah, kehilangan kekuatan, perubahan tegangan, dan musim / iklim / cuaca. Akibat adanya gaya-gaya luar yang bekerja pada material pembentuk lerengmenyebbakan material pembentuk lereng mempunyai kecenderungan untuk menggelincir. Kata kunci: Lereng; Tanah; Tektonik; GeologKOTASEMARANG
ANALISIS POTENSI BENCANA LONGSOR MENGGUNAKAN METODE KINEMATIK DI DESA JABUNGAN, KOTA SEMARANG Perkasa, Leony Isda; Dirostrimila, Najwa Humaira; Soputan, Puspo Anggreiny Putri; Widiarso, Dian Agus
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.154

Abstract

Research area is a residential area located in Jabungan, Banyumanik, Semarang, Central Java. The research focuses on analyzing the potential of landslides that can occur. The research slope is located with residential areas and roads. Based on the potential damage that can occur if the slope slides become the background of this study. Near the research location which is a residential area and roads, the slope stability factor needs to be considered because a stable slope causes the slope to be safe and there is less possibility of landslides. Landslide is the movement of the soil mass or the expanse of experience plane or a shear surface plane. The types of landslides have a relationship with the geological structures that cause discontinuities in a rock mass. One of the steps to determine the possibility of landslides from a slope is the kinematic analysis method. Kinematic analysis is carried out with the aim of knowing the types of landslides that may occur. After doing kinematic analysis, the slope is possible for landslides to occur. By knowing the potential of landslides, it can be used as a basis for mitigation so that landslides not occur in the area that can cause losses.
ANALISIS TINGKAT KELONGSORAN MENGGUNAKAN METODE ROCK MASS RATING (RMR) , SLOPE MASS RATING (SMR) SERTA METODE BISHOP PADA LERENG BATUAN X, KELURAHAN JANGLI, KECAMATAN TEMBALANG, KOTA SEMARANG Nickolas, Syafrichard Ihsan; Nurfaizi, Nick; Husain, Habib; Widiarso, Dian Agus
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.155

Abstract

Kawasan penelitian berlokasi di Kelurahan Jangli, Kecamatan Tembalang, Kota Semarang. Kawasan ini berada dekat dengan kawasan pemukiman sehingga faktor keamanan lereng menjadi faktor penting yang harus diperhatikan. Lereng batuan yang aman dari longsor tentunya harus memenuhi berbagai kriteria dan pembobotan tertentu sesuai dengan metode yang digunakan. Longsor merupakan pergerakan massa tanah atau batuan sepanjang bidang tergelincir atau suatu permukaan bidang geser. Terjadinya suatu peristiwa tanah longsor tentunya disebabkan oleh berbagai faktor-faktor alam seperti adanya peran dari struktur geologi, mekanika batuan, kuat tekan batuan, maupun faktor geologi lainnya. Adapun penelitian kali ini memiliki fokus utama terkait dengan analisis RMR dan SMR dan penggunaan metode Bishop dalam mengidentifikasi tingkat kelongsoran lereng batuan penelitian. Dari penelitian yang telah dilakukan, diketahui bahwasanya pada metode RMR didapati nilai pembobotan sebesar 72 yang, menurut klasifikasi Bieniawski (1989), termasuk dalam kelas II atau "Pemerian Baik". Sementara dalam analisis SMR, hasil perhitungan mengungkapkan persentase kinematika wedge sliding sebesar 0,62%. Pembobotan F1, F2, F3, dan F4 menghasilkan nilai SMR sebesar 86,1, yang secara klasifikasi dikategorikan sebagai "very good" atau "sangat baik". Hasil pengolahan data dengan menggunakan Metode Bishop juga menunjukkan nilai kondisi lereng yang aman, baik dalam kondisi kering maupun kondisi jenuh, di mana nilai yang diperoleh menunjukkan FK>1,25. Dengan demikian, bahwa kondisi massa batuan di lokasi tersebut sangat stabil, dengan potensi kegagalan atau longsoran yang rendah
Active Tectonics of the Garsela Fault Utilizing Morphotectonics and Seismicity in Garut Regency, Indonesia Pristiwantoro, Rafa Nurul Zahra; Fahrudin; Widiarso, Dian Agus; Moechtar, Rio Alcanadre Tanjung; Cita, Akbar
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.20209

Abstract

Tectonic activity along active faults in Indonesia has a high potential to cause earthquakes with magnitudes greater than 6.5. This research focuses on the Garsela Fault in Garut Regency, West Java, which has a history of shallow earthquakes occuring near nationally important infrastructure. Morphotectonic analysis, Maximum Credible Earthquake (MCE) calculations, geological structure measurements, and subsurface condition assessments were conducted to determine the tectonic activity around the Garsela Fault and its fault mechanism. The analysis results show that tectonic activity in Garut Regency ranges from low to high. The Garsela Fault is divided into two segments with different fault systems: the Rakutai Segment, a normal fault (16.22 km), and the Kencana Segment, a strike-slip fault (17.33 km). MCE calculations for the Garsela Fault indicate potential maximum magnitudes of 5.42, 5.54, 6.28, and 6.54. Shallow earthquakes may produce stronger tremors in the western part of the Rakutai Segment compared to the east. In addition, earthquakes originating from the Kencana Segment may also generate tremors in the southern part of Garut Regency.
Co-Authors Agnis Triahadini, Agnis Agus Setyawan Ainul Fatayatis Salamah Ajidityo Putro Fadhlillah Ajidityo Putro Fadhlillah Alif Febriansyah Alif Febriansyah Andi Kurniawan Arie Noor Rakhman Bagus Zaqqie Betraz A Cita, Akbar Dirostrimila, Najwa Humaira F.X. Yudi Triyono Fachrul Rozi Ramadhan fahrudin Giraldi, Devina Aldalivia Budhi Gregorius Agung Chrishartantyo Hadi Nugroho Hadi Nugroho Herfaes, Bey Anandha Husain, Habib Lutfi Hakim Moechtar, Rio Alcanadre Tanjung Mohammad Tommy Agus Binsar Neli Nikla Iklima Neli Nikla Iklima Nickolas, Syafrichard Ihsan Nurfaizi, Nick Okky Verdiansyah Okky Verdiansyah Perkasa, Leony Isda Prakosa Rachwibowo Pristiwantoro, Rafa Nurul Zahra Pudjihardjo Henarno Ragil Pratiwi Ragil Pratiwi Rana Lesmana Rana Lesmana Rinal Khaidar Ali Rio Andryantoro Rizal Dwi Febriyana Rizal Dwi Febriyana Rizki Trisna Hutami Saumi Rahmawati Saumi Rahmawati Soputan, Puspo Anggreiny Putri Suprapto, Rachdian Eko Tri Winarno Wahju Krisna Hidajat Yayan Yuliananto Yoga Aribowo Yoga Aribowo Yosep Purnama Yosep Purnama